Install the compat5x port. pkg_add -r compat5x or if you're using packages-7-current, make sure you export PACKAGESITE="ftp://ftp4.us.freebsd.org/pub/ports/i386/packages-7-current/All/" and pkg_add -r compat5x-i386-version (Complete packagename as prescribed by the FTP mirror via ls/dir)

install freebsd src via cvsup (current or stable), then run make in the NVIDIA-1.0-7676 directory which was created when you untarred the .tar.gz file in your home directory.